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Full text of "Text Book Of Mechanical Engineering"

830

Appendix II.

I  *



pressures, which soon reach their limit in cylindrical boilers;
so, stated briefly, a less economical boiler is adopted to secure
a more economical engine. It is a mistake to suppose all water-
tube boilers fit for forcing:, the following classifies the principal
types regarding this quality:

LIST OF TYPICAL WATER-TUBE BOILERS.
For Natural Draught only.

Babcock-Wilcox.

Root.

Lagrafel d'Allest.

Oriolle.
Niclausse.
De Naeger.

Belleville.

Capable of some Forcing.

\              Herreschof.

For Forced Draught.

Norman d.
Du Temple.

The four last-mentioned are most suitable for fast-speed war

Thornycroft.
Yarrow.

vessels, such as ' destroyers,' which require increased combustion
on occasion.

The Babcock-Wilcox boiler has been already described, and
n|ay be taken as a type of natural-draught boiler. , The Ntdamse